Trace number 1855188

Some explanations

A solver is run under the control of another program named runsolver. runsolver is in charge of imposing the CPU time limit and the memory limit to the solver. It also monitors some information about the process. The trace of the execution of a solver is divided into four (or five) parts:
  1. SOLVER DATA
    This is the output of the solver (stdout and stderr).
    Note that some very long lines in this section may be truncated by your web browser ! In such a case, you may want to use the "Download as text" link to get the trace as a text file.

    When the --timestamp option is passed to the runsolver program, each line output by the solver is prepended with a timestamp which indicates at what time the line was output by the solver. Times are relative to the start of the program, given in seconds. The first timestamp (if present) is estimated CPU time. The last timestamp is wall clock time.

    As some 'v lines' may be very long (sometimes several megabytes), the 'v line' output by your solver may be split on several lines to help limit the size of the trace recorded in the database. In any case, the exact output of your solver is preserved in a trace file.
  2. VERIFIER DATA
    The output of the solver is piped to a verifier program which will search a value line "v " and, if found, will check that the given interpretation satisfies all constraints.
  3. CONVERSION SCRIPT DATA (Optionnal)
    When a conversion script is used, this section shows the messages that were output by the conversion script.
  4. WATCHER DATA
    This is the informations gathered by the runsolver program. It first prints the different limits. There's a first limit on CPU time set to X seconds (see the parameters in the trace). After this time has ellapsed, runsolver sends a SIGTERM and 2 seconds later a SIGKILL to the solver. For safety, there's also another limit set to X+30 seconds which will send a SIGXPU to the solver. The last limit is on the virtual memory used by the process (see the parameters in the trace).
    Every ten seconds, the runsolver process fetches the content of /proc/loadavg, /proc/pid/stat and /proc/pid/statm (see man proc) and prints it as raw data. This is only recorded in case we need to investigate the behaviour of a solver. The memory used by the solver (vsize) is also given every ten seconds.
    When the solver exits, runsolver prints some informations such as status and time. CPU usage is the ratio CPU Time/Real Time.
  5. LAUNCHER DATA
    These informations are related to the script which will launch the solver. The most important informations are the command line given to the solver, the md5sum of the different files and the dump of the /proc/cpuinfo and /proc/meminfo which provides some useful information on the computer.

Solver answer on this benchmark

Solver NameAnswerCPU timeWall clock time
SAT4J Pseudo CP 2.1.1SAT 1.57376 1.03815

General information on the benchmark

Namenormalized-PB06/SATUNSAT-SMALLINT/submitted-PB05/aloul/
FPGA_SAT05/normalized-fpga13_13_sat_pb.cnf.cr.opb
MD5SUMbf7e21954a6ae09c036e6d4bdde8af91
Bench CategoryDEC-SMALLINT (no optimisation, small integers)
Best result obtained on this benchmarkSAT
Best value of the objective obtained on this benchmark0
Best CPU time to get the best result obtained on this benchmark0.006998
Has Objective FunctionNO
SatisfiableYES
(Un)Satisfiability was provedYES
Best value of the objective function
Optimality of the best value was proved NO
Number of variables254
Total number of constraints208
Number of constraints which are clauses182
Number of constraints which are cardinality constraints (but not clauses)26
Number of constraints which are nor clauses,nor cardinality constraints0
Minimum length of a constraint6
Maximum length of a constraint13
Number of terms in the objective function 0
Biggest coefficient in the objective function 0
Number of bits for the biggest coefficient in the objective function 0
Sum of the numbers in the objective function 0
Number of bits of the sum of numbers in the objective function 0
Biggest number in a constraint 1
Number of bits of the biggest number in a constraint 1
Biggest sum of numbers in a constraint 14
Number of bits of the biggest sum of numbers4
Number of products (including duplicates)0
Sum of products size (including duplicates)0
Number of different products0
Sum of products size0

Solver Data 

0.08/0.14	c SAT4J: a SATisfiability library for Java (c) 2004-2008 Daniel Le Berre
0.08/0.14	c This is free software under the dual EPL/GNU LGPL licenses.
0.08/0.14	c See www.sat4j.org for details.
0.08/0.15	c version 2.1.1.v20090612
0.08/0.16	c sun.arch.data.model	32
0.08/0.16	c java.version	1.6.0_12
0.08/0.16	c os.name	Linux
0.08/0.16	c os.version	2.6.9-22.EL.rootsmp
0.08/0.16	c os.arch	i386
0.08/0.16	c Free memory 1342000320
0.08/0.16	c Max memory 1344274432
0.08/0.16	c Total memory 1344274432
0.08/0.16	c Number of processors 2
0.22/0.22	c Pseudo Boolean Optimization
0.22/0.22	c Cutting planes based inference (org.sat4j.pb.core.PBSolverCP)
0.22/0.22	c --- Begin Solver configuration ---
0.22/0.22	c Stops conflict analysis at the first Unique Implication Point
0.22/0.22	c org.sat4j.pb.constraints.PBMaxClauseCardConstrDataStructure@1d520c4
0.22/0.22	c Learn all clauses as in MiniSAT
0.22/0.22	c claDecay=0.999 varDecay=0.95 conflictBoundIncFactor=1.5 initConflictBound=100 
0.22/0.22	c VSIDS like heuristics from MiniSAT using a heap phase appearing in latest learned clause taking into account the objective function
0.22/0.22	c No reason simplification
0.22/0.22	c MiniSAT restarts strategy
0.22/0.22	c Memory based learned constraints deletion strategy
0.22/0.22	c timeout=2147483s
0.22/0.22	c DB Simplification allowed=false
0.22/0.22	c --- End Solver configuration ---
0.22/0.22	c solving HOME/instance-1855188-1244870120.opb
0.22/0.22	c reading problem ... 
0.32/0.37	c ... done. Wall clock time 0.15s.
0.32/0.37	c #vars     254
0.32/0.37	c #constraints  208
0.32/0.37	c constraints type 
0.32/0.37	c org.sat4j.pb.constraints.pb.OriginalHTClausePB => 182
0.32/0.37	c org.sat4j.pb.constraints.pb.MinWatchCardPB => 26
1.41/0.90	c starts		: 1
1.41/0.90	c conflicts		: 74
1.41/0.90	c decisions		: 626
1.41/0.90	c propagations		: 2129
1.41/0.90	c inspects		: 17245
1.41/0.90	c learnt literals	: 0
1.41/0.90	c learnt binary clauses	: 0
1.41/0.90	c learnt ternary clauses	: 0
1.41/0.90	c learnt clauses	: 74
1.41/0.90	c ignored clauses	: 0
1.41/0.90	c root simplifications	: 0
1.41/0.90	c removed literals (reason simplification)	: 0
1.41/0.90	c reason swapping (by a shorter reason)	: 0
1.41/0.90	c Calls to reduceDB	: 0
1.41/0.90	c speed (assignments/second)	: 4055.238095238095
1.41/0.90	c non guided choices	74
1.41/0.90	c learnt constraints type 
1.41/0.90	c org.sat4j.pb.constraints.pb.LearntHTClausePB => 1
1.41/0.90	c org.sat4j.pb.constraints.pb.MinWatchCardPB => 31
1.41/0.90	c org.sat4j.pb.constraints.pb.MaxWatchPb => 42
1.41/0.90	c constraints type 
1.41/0.90	c org.sat4j.pb.constraints.pb.OriginalHTClausePB => 182
1.41/0.90	c org.sat4j.pb.constraints.pb.MinWatchCardPB => 26
1.41/0.90	s SATISFIABLE
1.41/0.91	v -x1 -x2 -x3 -x4 -x5 -x6 -x7 -x8 x9 -x10 -x11 -x12 -x13 x14 -x15 -x16 -x17 -x18 -x19 -x20 -x21 -x22 -x23 -x24 -x25 -x26 -x27 -x28 x29 -x30 -x31 -x32 -x33 -x34 -x35 -x36 -x37 -x38 -x39 -x40 -x41 -x42 -x43 x44 -x45 -x46 -x47 -x48 -x49 -x50 -x51 -x52 -x53 -x54 -x55 -x56 -x57 -x58 -x59 x60 -x61 -x62 -x63 -x64 -x65 -x66 x67 -x68 -x69 -x70 -x71 -x72 -x73 -x74 -x75 -x76 -x77 -x78 -x79 -x80 -x81 -x82 -x83 -x84 -x85 -x86 -x87 -x88 -x89 x90 -x91 -x92 -x93 -x94 -x95 -x96 -x97 -x98 -x99 -x100 -x101 -x102 -x103 x104 -x105 -x106 -x107 -x108 -x109 -x110 x111 -x112 -x113 -x114 -x115 -x116 -x117 -x118 -x119 -x120 x121 -x122 -x123 -x124 -x125 -x126 -x127 -x128 -x129 -x130 -x131 -x132 -x133 -x134 -x135 -x136 -x137 -x138 -x139 -x140 x141 -x142 -x143 -x144 -x145 -x146 -x147 -x148 x149 -x150 -x151 -x152 -x153 -x154 -x155 -x156 -x157 -x158 -x159 -x160 -x161 -x162 -x163 -x164 -x165 x166 -x167 -x168 -x169 x170 -x171 -x172 -x173 -x174 -x175 -x176 x177 -x178 -x179 -x180 -x181 -x182 -x183 -x184 -x185 -x186 x187 -x188 -x189 -x190 x191 -x192 -x193 -x194 -x195 -x196 -x197 x198 -x199 -x200 -x201 x202 -x203 -x204 -x205 -x206 -x207 -x208 -x209 -x210 -x211 x212 -x213 x214 -x215 -x216 -x217 -x218 -x219 -x220 -x221 -x222 -x223 x224 -x225 -x226 -x227 -x228 -x229 -x230 -x231 x232 -x233 -x234 -x235 -x236 x237 -x238 -x239 -x240 -x241 -x242 x243 -x244 -x245 -x246 -x247 x248 -x249 -x250 -x251 -x252 -x253 -x254 
1.41/0.91	c Total wall clock time (in seconds): 0.682

Verifier Data 

OK	0

Watcher Data 

runsolver version 3.2.9 (svn:492) (c) roussel@cril.univ-artois.fr

command line: BIN/runsolver --timestamp -w /tmp/evaluation-result-1855188-1244870120/watcher-1855188-1244870120 -o /tmp/evaluation-result-1855188-1244870120/solver-1855188-1244870120 -C 1800 -W 2000 -M 1800 java6 -server -Xms1300m -Xmx1300m -jar HOME/org.sat4j.pb.jar CuttingPlanes HOME/instance-1855188-1244870120.opb 

Enforcing CPUTime limit (soft limit, will send SIGTERM then SIGKILL): 1800 seconds
Enforcing CPUTime limit (hard limit, will send SIGXCPU): 1830 seconds
Enforcing wall clock limit (soft limit, will send SIGTERM then SIGKILL): 2000 seconds
Enforcing VSIZE limit (soft limit, will send SIGTERM then SIGKILL): 1843200 KiB
Enforcing VSIZE limit (hard limit, stack expansion will fail with SIGSEGV, brk() and mmap() will return ENOMEM): 1894400 KiB
Current StackSize limit: 10240 KiB


[startup+0 s]
/proc/loadavg: 0.92 0.98 0.99 2/64 10347
/proc/meminfo: memFree=1008992/2055920 swapFree=4172160/4192956
[pid=10347] ppid=10345 vsize=152 CPUtime=0
/proc/10347/stat : 10347 (java6) R 10345 10347 9169 0 -1 0 41 0 0 0 0 0 0 0 21 0 1 0 154608406 155648 26 1992294400 134512640 134550932 4294956160 18446744073709551615 3531556 0 0 4096 0 0 0 0 17 1 0 0
/proc/10347/statm: 38 26 19 9 0 4 0

[startup+0.0558699 s]
/proc/loadavg: 0.92 0.98 0.99 2/64 10347
/proc/meminfo: memFree=1008992/2055920 swapFree=4172160/4192956
[pid=10347] ppid=10345 vsize=1470088 CPUtime=0.04
/proc/10347/stat : 10347 (java) S 10345 10347 9169 0 -1 0 3215 0 1 0 2 2 0 0 18 0 7 0 154608406 1505370112 2960 1992294400 134512640 134550932 4294956000 18446744073709551615 4294960144 0 0 0 16784584 18446744073709551615 0 0 17 1 0 0
/proc/10347/statm: 367522 2960 1007 9 0 364873 0
Current children cumulated CPU time (s) 0.04
Current children cumulated vsize (KiB) 1470088

[startup+0.102878 s]
/proc/loadavg: 0.92 0.98 0.99 2/64 10347
/proc/meminfo: memFree=1008992/2055920 swapFree=4172160/4192956
[pid=10347] ppid=10345 vsize=1472584 CPUtime=0.08
/proc/10347/stat : 10347 (java) S 10345 10347 9169 0 -1 0 3598 0 1 0 6 2 0 0 18 0 12 0 154608406 1507926016 3341 1992294400 134512640 134550932 4294956000 18446744073709551615 4294960144 0 0 0 16800975 18446744073709551615 0 0 17 1 0 0
/proc/10347/statm: 368146 3341 1066 9 0 365494 0
Current children cumulated CPU time (s) 0.08
Current children cumulated vsize (KiB) 1472584

[startup+0.301917 s]
/proc/loadavg: 0.92 0.98 0.99 2/64 10347
/proc/meminfo: memFree=1008992/2055920 swapFree=4172160/4192956
[pid=10347] ppid=10345 vsize=1475332 CPUtime=0.32
/proc/10347/stat : 10347 (java) S 10345 10347 9169 0 -1 0 5046 0 1 0 28 4 0 0 18 0 12 0 154608406 1510739968 4783 1992294400 134512640 134550932 4294956000 18446744073709551615 4294960144 0 0 0 16800975 18446744073709551615 0 0 17 1 0 0
/proc/10347/statm: 368833 4783 1353 9 0 366176 0
Current children cumulated CPU time (s) 0.32
Current children cumulated vsize (KiB) 1475332

[startup+0.701983 s]
/proc/loadavg: 0.92 0.98 0.99 2/64 10347
/proc/meminfo: memFree=1008992/2055920 swapFree=4172160/4192956
[pid=10347] ppid=10345 vsize=1478120 CPUtime=1.01
/proc/10347/stat : 10347 (java) S 10345 10347 9169 0 -1 0 7060 0 1 0 96 5 0 0 18 0 13 0 154608406 1513594880 6236 1992294400 134512640 134550932 4294956000 18446744073709551615 4294960144 0 0 0 16800975 18446744073709551615 0 0 17 1 0 0
/proc/10347/statm: 369530 6237 1407 9 0 366873 0
Current children cumulated CPU time (s) 1.01
Current children cumulated vsize (KiB) 1478120

Solver just ended. Dumping a history of the last processes samples

[startup+0.902019 s]
/proc/loadavg: 0.92 0.98 0.99 2/64 10347
/proc/meminfo: memFree=1008992/2055920 swapFree=4172160/4192956
[pid=10347] ppid=10345 vsize=1482076 CPUtime=1.41
/proc/10347/stat : 10347 (java) S 10345 10347 9169 0 -1 0 9118 0 1 0 135 6 0 0 18 0 14 0 154608406 1517645824 7741 1992294400 134512640 134550932 4294956000 18446744073709551615 4294960144 0 0 0 16800975 18446744073709551615 0 0 17 1 0 0
/proc/10347/statm: 370519 7741 1414 9 0 367862 0
Current children cumulated CPU time (s) 1.41
Current children cumulated vsize (KiB) 1482076

[startup+1.00104 s]
/proc/loadavg: 0.92 0.98 0.99 2/75 10361
/proc/meminfo: memFree=978376/2055920 swapFree=4172160/4192956
[pid=10347] ppid=10345 vsize=1487492 CPUtime=1.54
/proc/10347/stat : 10347 (java) S 10345 10347 9169 0 -1 0 10587 0 1 0 148 6 0 0 18 0 11 0 154608406 1523191808 9051 1992294400 134512640 134550932 4294956000 18446744073709551615 4294960144 0 0 0 16800975 18446744073709551615 0 0 17 1 0 0
/proc/10347/statm: 371873 9053 1415 9 0 369216 0
[pid=10347/tid=10349] ppid=10345 vsize=1487652 CPUtime=0.61
/proc/10347/task/10349/stat : 10349 (java) S 10345 10347 9169 0 -1 64 5187 0 1 0 57 4 0 0 16 0 11 0 154608407 1523355648 9057 1992294400 134512640 134550932 4294956000 18446744073709551615 4294960144 0 4 0 16800975 0 0 0 -1 1 0 0
[pid=10347/tid=10350] ppid=10345 vsize=1487652 CPUtime=0
/proc/10347/task/10350/stat : 10350 (java) S 10345 10347 9169 0 -1 64 3 0 0 0 0 0 0 0 19 0 11 0 154608409 1523355648 9057 1992294400 134512640 134550932 4294956000 18446744073709551615 4294960144 0 4 0 16800975 0 0 0 -1 0 0 0
[pid=10347/tid=10351] ppid=10345 vsize=1487652 CPUtime=0
/proc/10347/task/10351/stat : 10351 (java) S 10345 10347 9169 0 -1 64 0 0 0 0 0 0 0 0 20 0 11 0 154608409 1523355648 9057 1992294400 134512640 134550932 4294956000 18446744073709551615 4294960144 0 4 0 16800975 0 0 0 -1 0 0 0
[pid=10347/tid=10352] ppid=10345 vsize=1487652 CPUtime=0
/proc/10347/task/10352/stat : 10352 (java) S 10345 10347 9169 0 -1 64 2 0 0 0 0 0 0 0 16 0 11 0 154608411 1523355648 9057 1992294400 134512640 134550932 4294956000 18446744073709551615 4294960144 0 0 0 16800975 0 0 0 -1 1 0 0
[pid=10347/tid=10353] ppid=10345 vsize=1487652 CPUtime=0
/proc/10347/task/10353/stat : 10353 (java) S 10345 10347 9169 0 -1 64 9 0 0 0 0 0 0 0 22 0 11 0 154608411 1523355648 9057 1992294400 134512640 134550932 4294956000 18446744073709551615 4294960144 0 4 0 16800975 0 0 0 -1 0 0 0
[pid=10347/tid=10354] ppid=10345 vsize=1487652 CPUtime=0
/proc/10347/task/10354/stat : 10354 (java) S 10345 10347 9169 0 -1 64 4 0 0 0 0 0 0 0 23 0 11 0 154608411 1523355648 9057 1992294400 134512640 134550932 4294956000 18446744073709551615 4294960144 0 4 0 16800975 0 0 0 -1 0 0 0
[pid=10347/tid=10356] ppid=10345 vsize=1487652 CPUtime=0.5
/proc/10347/task/10356/stat : 10356 (java) R 10345 10347 9169 0 -1 64 3350 0 0 0 49 1 0 0 17 0 11 0 154608416 1523355648 9057 1992294400 134512640 134550932 4294956000 18446744073709551615 104163268 0 4 0 16800975 0 0 0 -1 1 0 0
[pid=10347/tid=10357] ppid=10345 vsize=1487652 CPUtime=0.4
/proc/10347/task/10357/stat : 10357 (java) S 10345 10347 9169 0 -1 64 1295 0 0 0 40 0 0 0 17 0 11 0 154608416 1523355648 9057 1992294400 134512640 134550932 4294956000 18446744073709551615 4294960144 0 4 0 16800975 0 0 0 -1 1 0 0
[pid=10347/tid=10358] ppid=10345 vsize=1487652 CPUtime=0
/proc/10347/task/10358/stat : 10358 (java) S 10345 10347 9169 0 -1 64 0 0 0 0 0 0 0 0 25 0 11 0 154608416 1523355648 9057 1992294400 134512640 134550932 4294956000 18446744073709551615 4294960144 0 4 0 16800975 0 0 0 -1 0 0 0
[pid=10347/tid=10360] ppid=10345 vsize=1487652 CPUtime=0
/proc/10347/task/10360/stat : 10360 (java) S 10345 10347 9169 0 -1 64 4 0 0 0 0 0 0 0 19 0 11 0 154608445 1523355648 9057 1992294400 134512640 134550932 4294956000 18446744073709551615 4294960144 0 4 0 16800975 0 0 0 -1 0 0 0
Current children cumulated CPU time (s) 1.54
Current children cumulated vsize (KiB) 1487492

Child status: 10
Real time (s): 1.03815
CPU time (s): 1.57376
CPU user time (s): 1.49977
CPU system time (s): 0.073988
CPU usage (%): 151.593
Max. virtual memory (cumulated for all children) (KiB): 1487492

getrusage(RUSAGE_CHILDREN,...) data:
user time used= 1.49977
system time used= 0.073988
maximum resident set size= 0
integral shared memory size= 0
integral unshared data size= 0
integral unshared stack size= 0
page reclaims= 10665
page faults= 1
swaps= 0
block input operations= 0
block output operations= 0
messages sent= 0
messages received= 0
signals received= 0
voluntary context switches= 353
involuntary context switches= 223

runsolver used 0.001999 second user time and 0.014997 second system time

The end

Launcher Data 

Begin job on node48 at 2009-06-13 07:15:21
IDJOB=1855188
IDBENCH=1445
IDSOLVER=681
FILE ID=node48/1855188-1244870120
PBS_JOBID= 9354327
Free space on /tmp= 66264 MiB

SOLVER NAME= SAT4J Pseudo CP 2.1.1
BENCH NAME= PB06//final/normalized-PB06/SATUNSAT-SMALLINT/submitted-PB05/aloul/FPGA_SAT05/normalized-fpga13_13_sat_pb.cnf.cr.opb
COMMAND LINE= java6 -server -Xms1300m -Xmx1300m -jar HOME/org.sat4j.pb.jar CuttingPlanes BENCHNAME
RUNSOLVER COMMAND LINE= BIN/runsolver --timestamp -w /tmp/evaluation-result-1855188-1244870120/watcher-1855188-1244870120 -o /tmp/evaluation-result-1855188-1244870120/solver-1855188-1244870120 -C 1800 -W 2000 -M 1800  java6 -server -Xms1300m -Xmx1300m -jar HOME/org.sat4j.pb.jar CuttingPlanes HOME/instance-1855188-1244870120.opb

TIME LIMIT= 1800 seconds
MEMORY LIMIT= 1800 MiB
MAX NB THREAD= 0

MD5SUM BENCH= bf7e21954a6ae09c036e6d4bdde8af91
RANDOM SEED=1656826389

node48.alineos.net Linux 2.6.9-22.EL.rootsmp #1 SMP Mon Oct 3 08:59:52 CEST 2005

/proc/cpuinfo:
processor	: 0
vendor_id	: GenuineIntel
cpu family	: 15
model		: 4
model name	:                   Intel(R) Xeon(TM) CPU 3.00GHz
stepping	: 3
cpu MHz		: 3000.270
cache size	: 2048 KB
fpu		: yes
fpu_exception	: yes
cpuid level	: 5
wp		: yes
flags		: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm syscall nx lm pni monitor ds_cpl cid cx16 xtpr
bogomips	: 5914.62
clflush size	: 64
cache_alignment	: 128
address sizes	: 36 bits physical, 48 bits virtual
power management:

processor	: 1
vendor_id	: GenuineIntel
cpu family	: 15
model		: 4
model name	:                   Intel(R) Xeon(TM) CPU 3.00GHz
stepping	: 3
cpu MHz		: 3000.270
cache size	: 2048 KB
fpu		: yes
fpu_exception	: yes
cpuid level	: 5
wp		: yes
flags		: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm syscall nx lm pni monitor ds_cpl cid cx16 xtpr
bogomips	: 5586.94
clflush size	: 64
cache_alignment	: 128
address sizes	: 36 bits physical, 48 bits virtual
power management:


/proc/meminfo:
MemTotal:      2055920 kB
MemFree:       1009408 kB
Buffers:         62508 kB
Cached:         891496 kB
SwapCached:      14588 kB
Active:         101040 kB
Inactive:       871080 kB
HighTotal:           0 kB
HighFree:            0 kB
LowTotal:      2055920 kB
LowFree:       1009408 kB
SwapTotal:     4192956 kB
SwapFree:      4172160 kB
Dirty:             308 kB
Writeback:           0 kB
Mapped:          13608 kB
Slab:            60356 kB
Committed_AS:   119596 kB
PageTables:       1372 kB
VmallocTotal: 536870911 kB
VmallocUsed:    264952 kB
VmallocChunk: 536605679 kB
HugePages_Total:     0
HugePages_Free:      0
Hugepagesize:     2048 kB

Free space on /tmp at the end= 66264 MiB
End job on node48 at 2009-06-13 07:15:22